keyed-up

People whose mental or physical senses are less "keyed-up," less sensitive, call the Thoracic "rattle-brained."

The keyed-up Sam grunted at the suddenness of the shock and ran back for ten paces, gasping.

But to Diane's keyed-up consciousness it was as though the four short words contained a threat—the germ of future disaster.

She waited for him to speak—waited with a keyed-up intensity of longing that was almost physically painful.